Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.652968
Title: Parturition in the pig : the relationships between pain, stress and maternal behaviour
Author: Jarvis, S.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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Abstract:
The thesis examines the relationships between pain, stress and behaviour of the pig around parturition. This includes the effects of pregnancy and parturition on maternal nociception, and environmental restriction on stress physiology and behaviour. The main findings are: 1. Late pregnancy and parturition in the pig is associated with an endogenous analgesic system which is, at least in part, mediated via endogenous opioids. 2. Passivity and inactivity are major components of maternal behaviour in the pig and are suggested to be indicative of good maternal care in this species. The thesis provides evidence of an opioid mediation of maternal behaviour which could arise through several potential routes, namely: the action of the analgesic system, general sedation, the inhibition of oxytocin release. 3. A rise in plasma control, ACTH and β-endorphin concentrations were found in pre-parturient gilts housed in both straw bedded pens and conventional farrowing crates. However crates caused further stimulation of the HPA axis reflecting thwarting of nestbuilding behaviour in this restrictive environment. 4. The farrowing crate did not cause further HPA activity during the expulsive phase which may reflect the inactivity of the pig at this time. A rise in plasma cortisol was found as the expulsive phase progressed irrespective of environment however the thesis found that the expulsion of a piglet does not appear to play a major role in this. Overall the thesis has realised a better understanding of parturition in the pig by relating the physiology and behaviour of the pig at this time. The possibility of maternal pain influencing the progress of parturition and maternal behaviour is discussed in relation to possible mechanisms by which this may occur. The thesis has also highlighted welfare implications regarding the use of farrowing crates, and provides information which may be used when considering changes to housing for parturient pigs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.652968  DOI: Not available
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